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WATTS 909M1 RPDA - 6" - DOSY Reduced Pressure Detector Assembly - (0389340) - LF909OSY6 - UPC 98268819212 - 6 LF909M1-DOSY RPDA 


Lead Free: NO - 6 In Cast Iron Reduced Pressure Detector Assembly, Domestic Osy Shutoff, Cubic Feet Meter


This 6 inch reduced pressure detector assembly with its exclusive design incorporating the patented air-in and water-out principle for protection from the reverse flow of fire protection system substances from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. Its compact modular design facilitates easy maintenance for in-line repairs. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants found at the service line entrance. This assembly consists of a cast iron body, domestic outside stem and yoke resilient seated gate valves, captured spring check valves, replaceable seats, top mounted test cocks, a pressure differential relief valve, and a cubic foot per minute meter to detect underground leaks and unauthorized water use.



  • Cubic feet per minute meter
  • Maximum flow at low pressure drop
  • Compact for economy combined with performance
  • No special tools are required for servicing
  • Fused epoxy coated cast iron body
  • Health hazard application
  • No special tools required for servicing
  • Replaceable seats
  • Simple design for easy maintenance


Backflow Preventer Type Reduced Pressure Detector Assembly
Body Finish Epoxy Coated
Body Material Cast Iron
Body Pattern Inline
Brand Name Watts
Buy American Act USA
Bypass Yes
Bypass Size 3/4 IN
Cap And Tether No
Disc Material Rubber
EAN 098268819212
Elbow Fitting No
Hazard Protection Level Health Hazard
Hot And Harsh Water No
Hydrant Connection No
Inlet Connection Size 6 IN
Inlet Connection Size-Metric 150 MM
Inlet Connection Type Mechanical Joint
Inlet Shutoff Valve Type Outside Stem And Yoke Gate Valve
Lead Free NO
Maximum Temperature-Fahrenheit 140
Maximum Working Pressure-BAR 12.10
Maximum Working Pressure-PSI 175
Meter Type CFM
Minimum Temperature - Celsius 0.50
Minimum Temperature-Fahrenheit 33
Outlet Connection Size 6 IN
Outlet Connection Type Mechanical Joint
Outlet Shutoff Valve Type Outside Stem And Yoke Gate Valve
Part Number 0389340
Polymer Coating No
Pressure Operation Continuous
Protection Type Backpressure and Backsiphonage
Seat Material Bronze
Series 909RPDA
Strainer No
Tradename None
Type Kit




WATTS 909M1 RPDA - 6" - DOSY Reduced Pressure Detector Assembly - (0389340)

SKU: 0389340